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Перпендикулярность прямых и плоскостей. Задача 3
Author:
liudmylas
В треугольнике АВС угол АСВ=150 градусов; BD- перпендикулярен АВС; ВС = 6; BD = 4. Найдите расстояние от точки D о АС.
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